If you are struggling at 1080p, drop to 720p (1280x720) . It’s the single most effective way to reduce the load on your GPU.
Before diving into every menu, these three changes offer the biggest "bang for your buck" in terms of frames per second (FPS). cities skylines settings for low end pc better
Avoid running the game on 3x speed constantly. The faster the game runs, the harder the CPU has to work to calculate pathfinding for every car and pedestrian. If you are struggling at 1080p, drop to 720p (1280x720)
Set this to Short or Disabled . Calculating shadows for every building and tree across the entire map is a massive resource drain. If you are struggling at 1080p